Steve Schaefer
,
Forbes Staff
If you can put the word markets after it, I cover it.

(Image credit: AFP/Getty Images via @daylife)

Several class action lawsuits have been filed on behalf of Facebook investors just a few days after the company went public, and after the closing bell Wednesday the story took another turn when trading firm Knight Capital Group disclosed a loss related to the botched debut of the company's shares.

According to an SEC filing Knight estimates a total pre-tax loss in the range of $30 to $35 million tied to the issues and problems at Nasdaq OMX Group around the opening of Facebook trading on May 18.

Knight says it has submitted claims for financial accommodations from the exchange operator, and "is also evaluating all remedies available under law," though it can not guarantee it will be able to recover any of the losses, which will adversely impact second-quarter results.

Shares of Knight Capital were down 2.3% after-hours Wednesday.

Facebook, which stumbled out of the gate Friday then went into freefall Monday and Tuesday, finally rebounded Wednesday, adding 3.2% to $32.00 and another 1% after-hours. Nasdaq shares lost 2.3%, after reports that the New York Stock Exchange has made informal overtures to Facebook regarding a change in listing venue.